gstreamer/libs/gst/base/gstpushsrc.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *                    2005 Wim Taymans <wim@fluendo.com>
 *
 * gstpushsrc.h:
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __GST_PUSH_SRC_H__
#define __GST_PUSH_SRC_H__

#include <gst/gst.h>
#include <gst/base/gstbasesrc.h>

G_BEGIN_DECLS

#define GST_TYPE_PUSH_SRC               (gst_push_src_get_type())
#define GST_PUSH_SRC(obj)               (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PUSH_SRC,GstPushSrc))
#define GST_PUSH_SRC_CLASS(klass)       (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PUSH_SRC,GstPushSrcClass))
#define GST_PUSH_SRC_GET_CLASS(obj)      (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_PUSH_SRC, GstPushSrcClass))
#define GST_IS_PUSH_SRC(obj)            (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PUSH_SRC))
#define GST_IS_PUSH_SRC_CLASS(klass)    (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PUSH_SRC))

typedef struct _GstPushSrc GstPushSrc;
typedef struct _GstPushSrcClass GstPushSrcClass;

/**
 * GstPushSrc:
 *
 * The opaque #GstPushSrc data structure.
 */
struct _GstPushSrc {
  GstBaseSrc     parent;

  /*< private >*/
  gpointer _gst_reserved[GST_PADDING];
};

/**
 * GstPushSrcClass:
 * @parent_class: Element parent class
 * @create: Ask the subclass to create a buffer. The subclass decides which
 *          size this buffer should be. Other then that, refer to
 *          #GstBaseSrc<!-- -->.create() for more details. If this method is
 *          not implemented, @alloc followed by @fill will be called.
 * @alloc: Ask the subclass to allocate a buffer. The subclass decides which
 *         size this buffer should be. The default implementation will create
 *         a new buffer from the negotiated allocator.
 * @fill: Ask the subclass to fill the buffer with data.
 *
 * Subclasses can override any of the available virtual methods or not, as
 * needed. At the minimum, the @fill method should be overridden to produce
 * buffers.
 */
struct _GstPushSrcClass {
  GstBaseSrcClass parent_class;

  /* ask the subclass to create a buffer, the default implementation
   * uses alloc and fill */
  GstFlowReturn (*create) (GstPushSrc *src, GstBuffer **buf);
  /* allocate memory for a buffer */
  GstFlowReturn (*alloc)  (GstPushSrc *src, GstBuffer **buf);
  /* ask the subclass to fill a buffer */
  GstFlowReturn (*fill)   (GstPushSrc *src, GstBuffer *buf);

  /*< private >*/
  gpointer _gst_reserved[GST_PADDING];
};

GST_BASE_API
GType gst_push_src_get_type (void);

G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstPushSrc, gst_object_unref)

G_END_DECLS

#endif /* __GST_PUSH_SRC_H__ */